platform/x86: intel_mid_powerbtn: Remove unnecessary init.h inclusion

No need to include linux/init.h when linux/module.h is.

No functional change intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/intel_mid_powerbtn.c

@@ -16,7 +16,6 @@
  * General Public License for more details.
  */
 
-#include <linux/init.h>
 #include <linux/input.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/intel_msic.h>